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ECMAScript 6 (ES6): What’s New In The Next Version Of JavaScript


  

You’ve probably heard about ECMAScript 6 (or ES6) already. It’s the next version of JavaScript, and it has some great new features. The features have varying degrees of complexity and are useful in both simple scripts and complex applications. In this article, we’ll discuss a hand-picked selection of ES6 features that you can use in your everyday JavaScript coding.

ES6: What's New In The Next Version Of JavaScript

Please note that support for these new ES6 features is well underway in modern browsers, although support varies. If you need to support old versions of browsers that lack many ES6 features, I’ll touch on solutions that might help you start using ES6 today.

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Introducing RAIL: A User-Centric Model For Performance


  

There’s no shortage of performance advice, is there? The elephant in the room is the fact that it’s challenging to interpret: Everything comes with caveats and disclaimers, and sometimes one piece of advice can seem to actively contradict another. Phrases like “The DOM is slow” or “Always use CSS animations” make for great headlines, but the truth is often far more nuanced.

RAIL Performance Model

Take something like loading time, the most common performance topic by far. The problem with loading time is that some people measure Speed Index, others go after first paint, and still others use body.onload, DOMContentLoaded or perhaps some other event. It’s rarely consistent. When it comes to other ways to measure performance, you’ve probably seen enough JavaScript benchmarks to last a lifetime. You may have also heard that 60 FPS matters. But when? All the time? Seems unrealistic.

The post Introducing RAIL: A User-Centric Model For Performance appeared first on Smashing Magazine.

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